body {
  margin: 0;
  padding: 0;
  background-image: url('../images/u0.png');
  background-size: cover;
  overflow: hidden;
}

.container {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 90vh;
}

.content {
  background: linear-gradient(rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.5));
  padding: 60px;
  text-align: center;
  width: 60%;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}

.banner {
  background-color: #003366;
  color: white;
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 3vh;
}

.banner-title {
  font-weight: bold;
  font-size: 20px;
}

.banner-links a {
  color: white;
  text-decoration: none;
  margin-left: 10px;
  margin-right: 10px;
}

.grade-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
}

    .grade-table input {
        font-size: 16px;
        top: 0;
        left: 0;
        width: 100%;
        height: 30px;
        padding: 0;
        margin: 0;
        border: none;
        background: transparent;
        text-align: center;
    }

.grade-table th,
.grade-table td {
  padding: 8px;
  text-align: center;
  border: 1px solid #ccc;
}

.grade-table th {
  background-color: #ddd;
  color: #333;
}

.grade-table tr:nth-child(even) {
  background-color: #fff;
}

.grade-table tr:nth-child(odd) {
  background-color: #f6f6f6;
}

button {
  padding: 10px 20px;
  font-size: 25px;
  margin-bottom: 10px;
  font-family: KaiTi;
  background-color: #48c;
  border: none;
  cursor: pointer;
  color: #fff; /* 设置按钮文字颜色为白色 */
}

button:hover {
  background-color: #004499;
}

.buttons button {
  margin: 0 10px;
  padding: 10px 20px;
  margin-top: 40px
}

     /* 添加遮罩样式 */
        .overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 9999;
            overflow: hidden;
            transition: height 0.2s ease-in-out, opacity 0.5s ease-in-out;
        }

        .overlay.hidden {
            height: 0%;
            opacity: 0;
        }

        .overlay2 {
            position: fixed;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 9999;
            overflow: hidden;
            transition: height 0.2s ease-in-out, opacity 0.5s ease-in-out;
        }

        .overlay2.hidden {
            height: 0%;
            opacity: 0;
        }
